A starship navigator measures the distance between the Earth and the sun. If the ship is moving at a speed of 0.90 c, instead of obtaining 93 million miles, the navigator measures a distance (in millions of miles) of
a. 41.
b. 30.
c. 80.
d. 215.
e. 90.
A
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If the layering of the close-packed planes in a FCC metal is ABCABCBACBA, this is a _____________.
Fill in the blank(s) with the appropriate word(s).
A cable with known tension force T is anchored at C and passes over a frictionless drum (see figure). The pin force components Bx and By (in terms of cable force variable T) for the pin connection at B are:
(A) 2T, 2T
(B) 22T, T
(C) 2T, 2T
(D) 2T, 3T/2
Which of the following methods used to determine the mass of a cluster of galaxies does not depend on Newton's law of gravity?
A) measuring the amount of distortion caused by a gravitational lens B) measuring the temperature of X-ray gas in the intracluster medium C) measuring the orbital velocities of galaxies in the cluster D) none of the above
You are asked to select a material for a barge tow line that must be as strong as steel cable, but can float on water and is not corroded by salt water. What material discussed in this chapter might be suitable?
What will be an ideal response?